Tube-bending machine.



W. P. FRANK.

TUBE BENDING MACHINE.

APPLICATON FILED 0m43.191s.

L. Patented. M ,1917.

2 SHEETS-SH T l.

W. P. FRANK.

TUBE BENDING MACHINE.

APPLICATION FILED 050.123.1915.

1.225.426. PaIenIQd May 8,1917.

2 SHEETS-SHEET 2.

IIII

y'VVIIILLIl-IIVI P. FRANK, OF CHICAGO, ILLINOIS.

TUBE-BENDING MACHINE.

Specification of Ifetters Patent.

4Paniented May 8, 1917.

Application led December 18, 1915. Serial No. 67,606.

To all whom t may concern:

Be it known that I, VILLIAM P. F RANK, a citizen of the United States, and a residentof the city of Chicago, county of Cook, and State of Illinois, have invented certain new" and useful Improvements in Tube- Bending Machines, of which the following is a specification.

My invention relates to improvements in tube bending machines, and has for its object the provision of an improved construction of this character which is capable of bending tubes without buckling or distorting the same.

The invention consists in the combina'- tioiis and arrangements of parts hereinafter described and claimed.

The invention will be best understood by reference to the accompanying drawings forming a part of this specification, and in which, f

Figure 1 is a plan view of a construction embodying my invention,

Fig. 2, a section taken on line 2-2 of Fig. 1,

Fig. 3, a horizontal section of the con?.

struction, and

Fig. 4, a section taken on line L -4 of Fig. 3.

The preferred form of construction, as illustrated in the drawings comprises a base plate 5 which may be secured'in a vise or mounted in any suitable or desired manner.

vA rotatable head 6 is mounted on said base,

said head being provided with a spindle 7 rotating freely in said base. Head 6 is provided with an -annular groove Sfadapted to receive the corresponding portion of a tube '9 to be bent. The head 6 is provided with registering notches 10 at'one side thereof and a .pin 11 is insertible through said notches and also through a perforation formed in the corresponding end of the tube 9. A die member 12 is. arranged to enoompass substantially one-half of thehead 6 andl y is provided with a groove-13 corresponding -with groove 8 and copcrating therewith to form a recess and guidevof a size to just accommodate tube 9., An extension 14 is provided on die memfier 12 extending a short distance substantially tangentially to the head 6 and is provided with a groove 15 constituting a tangential extension of groove 13, as indicated. A wed'gemember 16 is arranged between die member 12 and an abutment 1-7 on basev plate 5 and serves as a .tating said head.

means for forcing die member 12 into c0- operative relation -with head 6 and holding it there.

I A lplug 18 of a size to fit nicely within tube 9 is mounted on oneJ end of a threaded stem 19 resting loosely in aslot in a bracket 20 on base plate 5. The stein 19 is provided with lock nuts 21 by means of which its position may be adjusted longitudinallyl and the bracket 20 is/so situated that the plug 18 may be positioned, as indicated in Fig. 3, substantially tangential to the head. 6 and with its end terminating substantially at the tangential point. An operating handle or lever 22. is provided with pins 23 adapted to Afit within corresponding openings in the" top of-head G to serve as a means forro- In use the parts are arranged as indicated in Fig. 1 with the plug 18 arranged within the tube 9 and pin 11 traversing the perforation in the end of said tube. Then head 6 is turned by means 'of lever 22 to drawthe tube end around through the groove 13 in die member'12. This will cause bending ofy the tube. 'into semi-circular form without buckling or materially distorting the same.

The plug 18 resting within the tube servesto prevent inward buckling of the metal' atv the tangentiall point which is the point where the bending takes place, and the walls of the grooves 13- and S prevent outward distortions of said tube. By this construction,

I find that tubesmay be -quickly and acculrately bent by a single manipulation -or operation without material distortion thereof.

VVhilc I have illustrated and described the preferred form of construction for carrying" my invention into eiiiect, this is capable of variation and modification without rotatable element provided with means for f engaging a tube; a plug insertiblc in a-'tiibe engaged by said element; and a grooved die.

partially encircling and copcrating with said element, substantially as described.

2. A tube bending machine comprising a grooved rotatable element provided With nicans for engaging a tube; a plug insertible operating with said element, substantially as described.

3. A tube bending machine comprising a base; a grooved head rotatably mounted in 'said base; a* grooved die partially encircling and coperating With said head; a Wedge for forcing said die into cooperating relation With said head; a threaded stem anchored Copies 'of this patent may be obtained for on said base substantially tangential to said head; and a plug on said stem positioned substantially at said tangent point and in- 15 -sertible in a tube arranged inv said grooves,

substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing Witnesses.

, WILLIAM P. FRANK.

Witnesses-z JOSHUA R. H. Po'rrs, B. G. RICHARDS.

ve cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

